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1 Cutaneous Mycoses in Chameleons Caused by Chrysosporium Anamorph Nannizziopsis vriesii (Apinis) Currah Author(s): Jean A. Paré, Lynne Sigler, D. Bruce Hunter, Richard C. Summerbell, Dale A. Smith and Karen L. Machin Source: Journal Zoo and Wildlife Medicine, Vol. 28, No. 4 (Dec., 1997), pp Published by: American Association Zoo Veterinarians Stable URL: Accessed: 02/02/ :24 Your use JSTOR archive indicates your acceptance Terms & Conditions Use, available at. JSTOR is a not-for-prit service that helps scholars, researchers, and students discover, use, and build upon a wide range content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms scholarship. For more information about JSTOR, please contact support@jstor.org.. American Association Zoo Veterinarians is collaborating with JSTOR to digitize, preserve and extend access to Journal Zoo and Wildlife Medicine.
2 Journal Zoo and Wildlife Medicine 28(4): , 1997 Copyright 1997 by American Association Zoo Veterinarians CUTANEOUS MYCOSES IN CHAMELEONS CAUSED BY THE CHRYSOSPORIUM ANAMORPH OF NANNIZZIOPSIS VRIESII (APINIS) CURRAH Jean A. Par?, D.M.V., D.V.Sc, Lynne Sigler, M.Sc, D. Bruce Hunter, D.V.M., M.Sc, Richard. C. Summerbell, Ph.D., Dale A. Smith, D.V.M., D.V.Sc, and Karen L. Machin, B.Sc, D.V.M. Abstract: A dermatophyte-like fungus isolated from skin biopsies three different species captive chameleon in which fungal elements had been observed by histologie examination. An adult Parson's chameleon {Chamaeleo parsonii) presented with vesicles that became crusty brown lesions on limbs and body. Skin biopsies revealed fungal hyphae in affected epidermis and underlying dermis. The lesions regressed fully after oral administration itraconazole. An adult jewel chameleon {Chamaeleo lateralis) from same private collection presented with localized black skin lesions and died while being treated with itraconazole. A pulmonary granuloma also present in this chameleon at autopsy. Cultures obtained from skin and lung lesions yielded same fungus. A third isolate obtained from a skin biopsy a Jackson's chameleon {Chamaeleo jacksoni) with deep ulcerative cutaneous lesions located at base tail. The fungus, in all three cases, has been identified as Chrysosporium anamorph Nannizziopsis vriesii, a poorly known ascomycetous species recorded previously from skin a lizard and from soil, on basis its keratinolytic activity, resistance to cycloheximide, strongly restricted growth at 37?C, formation cl?vate or pyriform single-celled or two-celled aleurioconidia, and alternate and fission arthroconidia. Key words: Chameleon, Chamaeleo, dermatomycosis, Chrysosporium, Nannizziopsis vriesii, itraconazole. INTRODUCTION Reviews diseases in reptiles belonging to order Squamata (Lacertilia and Serpentes) indicate that mycoses skin may be underreported, that causative agents are ten inadequately identified, and that it is ten difficult to evaluate wher isolated fungus is present as a contaminant or is involved in a pathologic process ? Cutaneous mycoses in humans and or mammals are usually caused by dermatophytes, but most reports skin infection concerning lacertilians and ophidians have been attributed to a wide variety soil fungi, including members genera Aspergillus,%X53243 Candida,*243 Ciadosporium,n Fusarium,41943 Geotri chum,2>4>'9>25<27>4] Monilia,'4 Mucor,20>32>40A3 Paecilomy ' ' ces, P?nicillium32 Rhizopus43 Trichoderma,19-32 Tri chosporon3243 Ulocladium43 and unidentified taxa.420 Fungi that have been associated with skin From Department Pathology, Ontario Veterinary College, University Guelph, Guelph, Ontario NIG 2W1, Canada (Par?, Hunter, Smith); University Al berta Micrungus Collection and Herbarium, Devonian Botanic Garden, Edmonton, Alberta T6G 2E1, Canada (Sigler); Ontario Ministry Health, Laboratory Ser vices Branch, 81 Resources Road, Etobicoke, Ontario M9P 3T1, Canada (Summerbell); and Department Veterinary Internal Medicine, Western College Veteri nary Medicine, University Saskatchewan, Saskatoon, Saskatchewan S7N 5B4, Canada (Machin). Present ad dress (Par?): Calgary Zoo, Box 3036, Station B, Calgary, Alberta T2M 4R8, Canada. lesions in Chamaeleonidae are Mucor circinel loides in a two-lined chameleon {Chamaeleo bi taeniatus) and a common chameleon (C. chamae leon)43 Candida guillermondii in a Fischer's cha meleon (C fischeri) and a Jackson's chameleon (C. jacksoni)43 an unidentified yeast in a Meller's cha meleon (C. melleri)4 Fusarium oxysporum in two flap-necked chameleons (C dilepis)443 and Asper g/z/ws sp. in a Jackson's chameleon.15 Dermatophytoses are fungal infections ke ratinized tissues caused by a group closely re lated keratinophilic fungi known as dermato phytes.39 Dermatophyte species belonging genera Trichophyton and Microsporum commonly cause skin disease in both humans and animals, but true dermatophytosis has rarely been recorded in lacertilians41732 and, to our knowledge, never in chameleons. The paucity reports linking derma tophytes with cutaneous disease prompted Aus twick and Key mer to state that "The susceptibility reptile skins to fungal infection clearly does not lie in direct invasion keratinized layers... by dermatophytes "4 Reports dermatophy toses in ophidians are also rare. Trichophyton mentagrophytes recovered from a ball python {Python regius) with dermal lesions,15 but most oth er reports involve species keratinophilic fungi soil origin that may be isolated as contaminants and for which demonstration a pathogenic role is dif ficult. Trichophyton terrestre, a geophilic fungus that is usually considered nonpathogenic, has been isolated from scales an apparently to healthy 443
3 444 JOURNAL OF ZOO AND WILDLIFE MEDICINE boa constrictor {Boa constrictor)4 and associ ated with progressive digital necrosis in eastern blue-tongued skinks {Tiliqua scincoides), in which numerous hyphae were seen histologically,17 but a causal relationship could not be ascertained. Al though fungal elements could be seen histological ly, wher y were primary etiologic agents or secondary invaders devitalized tissue could not be determined. An unknown Trichophyton species isolated from cutis and muscles a day gecko {Phelsuma sp.) with multiple nodular skin lesions.32 This one a group recently im ported geckos showing similar cutaneous lesions. A survey keratinophilic fungi from Australia demonstrated presence Microsporum cookei and Chrysosporium species a from epidermal scales clinically normal monitor lizard {Varanus sp.) and from skink Egernia bungana.3x Chrysospor ium sp. isolated from nodular subcutaneous le sions in a corn snake {Elaphe guttata guttata)4523 and C keratinophilum, C. tropicum, and Chrysos porium sp. have been cited as agents dermato mycoses in lizards {Varanus salvator, Lacerta vir idis, and Crotaphytus sp.).943 One report identified C. keratinophilum as an agent deep infection in volving lung and stomach in two iguanas.42 This report describes three cases skin infection in captive chameleons. The same fungus iso lated in pure culture, and fungal elements were demonstrated by histopathology biopsied lesions in two cases. The causative agent iden tified as Chrysosporium anamorph (mitotic stage) Nannizziopsis vriesii (Apinis) Curran, a poorly known ascomycetous fungus first described under name Rollandina vriesii Apinis3 for an isolate obtained from skin and lungs a lizard {Ameiva sp.). The fungus disposed subsequent ly as Arachnoca vriesii (Apinis) Samson38 and later as Nannizziopsis vriesii.12 Nannizziopsis vriesii is a member order Onygenales, family Ony genaceae,12 and records to date indicate that it is known only from original lizard isolate and one or from soil in California. Variability in micro scopic features suggests that this species could be misidentified or confused with dermatophyte spe cies such as Trichophyton mentagrophytes or T ter restre or with geophilic, keratinophilic Chrysospor ium or Malbranchea species. Its propensity to form fission arthroconidia could suggest Geotrichum. Case 1 CASE REPORTS An adult male Parson's chameleon {Chamaeleo parsonii) from a private collection presented to Veterinary Teaching Hospital Ontario Veterinary College for evaluation a skin lesion left stifle. The lizard had been purchased from a pet store 2 mo earlier, quarantined for 6 wk, and treated twice, at 10-day intervals, with fenben dazole (Safe Guard, Hoechst Canada Inc., Regina, Saskatchewan, Canada), 50 mg/kg orally, as ascarid eggs had been seen on a fecal flotation. The lizard fed crickets dusted with a multivitamin powder. It ate well, although it refused any or kind food, and drank well. Housing and husbandry met minimal standards recommended for mainte nance chameleons in captivity,13 except for in adequate ultraviolet radiation exposure. The lizard presented in late September, 45 days after wear made it impossible for owner to take it outside on a daily basis. The chameleon weighed 368 g and alert, re sponsive, and in good body condition. Abnormali ties were restricted to a 1 X 0.5 cm ovoid, de pressed area gray devitalized skin on crani olateral aspect left stifle. A thin crevice vis ible along rim lesion exposed dermis, suggesting that a large vesicle had ruptured and col lapsed. Within a week, two small gray vesicles, 3? 4 mm in diameter, appeared on lateral aspect right elbow. The chameleon anestized with islurane (AErrane, Anaquest, Mississauga, Ontario, Canada) delivered through an induction chamber and n through a face mask. Biopsies were taken from edge stifle lesion and from one elbow lesions using a 3-mm dis posable skin biopsy punch (Acu-Punch 3mm, Acu derm Inc., Fort Lauderdale, Florida 33307, USA). The resulting skin defects were closed with a single simple suture using polydioxanone monilament (PDS 3-0, Ethicon, Inc., Somerville, New Jersey 08876, USA). The or vesicle incised, and clear ex?date it contained collected and submitted for bacteriology. The patient dis charged from hospital with oral trimethoprim sulfamethoxazole (Apo-Sulfatrim, Apotex Inc., To ronto, Ontario, Canada), 30 mg/kg once daily, pending results biopsy. The culture negative for any bacterial agent. Poor sectioning biopsied tissues made histopathologic interpre tation difficult, but marked heterophilic infiltration epidermis and dermis noted. One week after initiation antibiotic rapy, lizard again presented with numerous new lesions on all limbs, flanks, and tail. These were roughly cir cular, focal, protruding brown encrustations that measured several millimeters in diameter. The ini tial lesion on stifle had thickened, and de vitalized skin had become a large thick scab. The
4 PAR? ET AL.?CUTANEOUS MYCOSES IN CHAMELEONS 445 Figure 1. Skin from a Parson's chameleon. Focal hyperkeratosis and coagulation necrosis stratum corneum are visible (arrow). Note discontinuity dermal melanophore layer (open arrow). H&E, X40. lizard anestized and three more skin biop sies were taken. Blood collected from ven tral tail vein and submitted for a complete blood cell count. A leukocytosis (34.5 X 109 cells/l, suggested reference range in lacertilians: X 109 cells/ L7) and a lymphocytosis (59%, or 20.3 X 109 cells/l) were prominent h?matologie findings. Occasional microntariae also were noted. On he matoxylin-eosin-stained sections, re focal hyperkeratosis with necrosis stratum cor neum and heterophilic infiltration subjacent epidermis and dermis (Fig. 1). Aggregates mac rophages and diffuse heterophil infiltration within deeper layers dermis were consistent with a deep heterophilic cellulitis. A periodic acid Schiff stain same section revealed fungal hy phae within affected stratum corneum and ad jacent epilium (Fig. 2) and deeper layers dermis. Hyphae were partly refractile and septate with minimal branching. A frozen biopsy submitted for culture yielded a slow-growing Trichophyton like fungus. The isolated fungus referred to University Alberta Micrungus Collection for furr study. An oral liquid suspension itraconazole (Jans sen Pharmaceutica, Beerse, Belgium; 10 mg/ml) added to treatment regimen (10 mg/kg once daily for 21 days). No new lesions appeared, and preexisting ones regressed partially and dried up. Antibiotic or to cessation rapy discontinued 1 week pri antifungal administration, 21 days after initial visit. The owner noted that cha meleon more reluctant to accept itracona zole than antibiotic. The lizard's appetite de clined over last few days medication, and owner required to hand-feed and, weeks later, force-feed lizard. The patient reevaluated 45 days from initial visit. Many skin lesions had disappeared, and no new lesion had appeared; how ever, a general loss condition noticed. The lizard appeared to favor left hind leg and would not grasp perches as easily as it did previously. Ra diographs suggested hepatomegaly. The packed cell volume (18%) had dropped from initial value (23%) but still within suggested reference range for lacertilians (16-45%).7 Elevated serum levels creatinine kinase (10,898 U/L) and aspar tate aminotransferase activity (>800 U/L) were
5 446 JOURNAL OF ZOO AND WILDLIFE MEDICINE Figure 2. Coagulation necrosis stratum corneum a Parson's chameleon cutaneous epilium. Note fungal hyphae in epidermis and dermis (arrows). PAS, X100. only biochemical abnormalities noted. Micrilariae were again visualized on blood smear. The chameleon's appetite increased and its gen eral body condition improved in months that followed. After ecdysis, only scab on stifle remained. The chameleon died about 1 year after initial presentation. Autopsy indicated that death due to cholecystitis and septicemia, but no ev idence Case 2 mycosis seen. An adult male jewel chameleon {Chamaeleo la teralis) purchased from same pet store by same collector presented for evaluation. The tiny lizard alert and active. It weighed 17 g and appeared in good flesh. There were two local ized areas black discoloration skin. One measured approximately 2 mm and involved right upper lip at mucocutaneous junction. The second lesion, slightly larger, located on dorsal aspect digits left hind foot (Fig. 3). A thin layer exfoliated squames partially cov ered pedal lesion, and a sample submitted for fungal culture. The chameleon sent home on itraconazole oral suspension, at a dosage 10 mg/kg once daily for 21 days. Six days after initi ation rapy, lizard found dead in vivarium. Postmortem examination revealed a gran ulomatous mass located in caudal lung and ex tending to wall coelomic cavity and to kidney. Histologie examination revealed presence a severe deep heterophilic cellulitis ex tending from skin surface into muscles foot. Periodic acid-schiff stain showed many hyphae in affected tissues. Numerous hyphae were also seen within granuloma involving lung and kidney (Fig. 4). A fungus identical to isolate from case 1 cultured from pedal squames, lungs, and kidney and for warded to University Alberta for furr evaluation. Case 3 An adult male Jackson's chameleon pre sented to Veterinary Teaching Hospital Western College Veterinary Medicine with a 2 cm round scab on left side, at base tail. The lizard weighed 100 g, alert and active. Blood analysis revealed a leukocytosis (32 X 109/L) with a lymphocytosis (83%, or 26.6 X 109/L). El
6 PAR? ET AL?CUTANEOUS MYCOSES IN CHAMELEONS 447 Figure 3. Black discoloration skin on dorsal aspect left hind foot and digits a jewel chameleon (arrows). Note exfoliative white squames. evated packed cell volume (57%) and total solids (15 g/dl) values suggested dehydration. The area debrided and cultured. Large numbers Clos tridium sp. were isolated as well as a fungus iden tified as a Trichophyton sp. This isolate iden tical to that cases 1 and 2, and a frozen biopsy later forwarded to University Alberta. Fluids were administered wound on a intracoelomically, bandaged, and lizard sent home trimethoprim-sulfamethoxazole oral suspen sion (Novotrimel, Novopharm Limited, Calgary, Alberta, Canada; 15 mg/kg b.i.d.) for 14 days. Ke toconazole (Nizoral, Janssen Pharmaceutica Inc., Mississauga, Ontario, Canada; 25 mg/kg, Q2D, p.o. for 4 wk) added to regimen when fungal culture results were obtained. The lizard re examined 2 wk later as a hemipenis had prolapsed through a ventral extension wound. The liz ard anestized with ketamine hydrochloride (Ketaset, Ayerst Laboratories, Montreal, Quebec, Canada; 20 mg/kg), and prolapsed hemipenis gently cleansed with saline and reduced through hole in ventral tail base. Closure wound performed using 4-0 NoviT (Davis & Geek, Cyanamid Medical Device Company Inc., Anyang, Korea). A second culture wound yielded Enterococcus faecalis and Staphylococcus sp. The antibiotics were changed to an amoxicillin clavulinic acid oral suspension (Clavamox drops, Smith Kline Beecham Animal Health Inc., Missis sauga, Ontario, Canada; 22 mg/kg b.i.d.), and ke toconazole continued. The chameleon pre sented 2 wk later with a recurrence hemi penis prolapse. The area necrotic skin al most circumferent around base tail. The hemipenis removed surgically under ketamine anessia, and tolnaftate (Tinactin, Schering Can ada Inc., Pointe Claire, Quebec, Canada) to be applied topically on a daily basis by owner. This chameleon n lost to follow-up. Mycological examination Isolates from cases 1 and 2 were deposited in University Alberta Micrtingus Collection as UAMH 7582 and The chameleon isolates were compared with known strains Nannizziop sis vriesii in all tests. Isolates N. vriesii included ex-type (culture derived from type speci men) (UAMH 3713 = ATCC = CBS = IMI ), which had been isolated from
7 448 JOURNAL OF ZOO AND WILDLIFE MEDICINE Figure 4. Chrysosporium anamorph Nannizziopsis vriesii hyphae in a necrotic focus in lung a chameleon. PAS, XlOO. jewel skin and lungs a lizard {Ameiva sp.) in Ner lands by G. A. de Vries, and an isolate from soil in sourn California (UAMH 3526). The case 3 isolate (UAMH 7861) obtained later and not included in all tests. For observation colonial features and growth rates, isolates were grown at 25?C on phytone yeast extract agar (Becton Dickinson Microbiology Sys terns, Cockeysville, Maryland 21030, USA), a mod ification Sabouraud dextrose medium that has been used for study Chrysosporium species, and potato dextrose agar (Difco Laboratories, Detroit, Michigan , USA). Media used for pro motion sporulation and development sexual stages included 10% Pablum cereal agar22 and oat meal agar22 with incubation at 22? or 25?C for 2-3
8 PAR? ET AL?CUTANEOUS MYCOSES IN CHAMELEONS 449 Figure 5. Colony Chrysosporium anamorph Nan nizziopsis vriesii on potato dextrose agar after 21 days at 25?C (UAMH 7583). X0.8. Figure 6. Pyriform or cl?vate sessile conidia formed on branched hyphae (UAMH 7582). X580. mo. In a subsequent attempt to obtain ascomata (sex ual fruiting bodies), isolates were grown at 30?C? 2?C on Takashio agar,22 amended with 5% yeast ex tract, and on oatmeal agar. Terminology for colony colors follows Kornerup and Wanscher.24 Because similarities between some Chrysosporium species and dermatophyte species, isolates also were subjected to a battery physiologic tests performed commonly in dermatophyte diagnostic. Isolates were evaluated for ir responses in following tests: 1) growth, ph change, and clearing milk solids on Bromcresol purple-milk solids-glucose agar compared to growth on Sabouraud dextrose agar (Difco); 2) urease activity in Christensen's urea broth22; 3) tolerance to cycloheximide at 400 xg ml ' by recording growth rates on mycosel agar2233; 4) tolerance to salt at con centrations 0, 3, 5, and 7% and measured as sodium chloride concentration causing >50% growth inhibition at 14 days'22; 5) requirements for vitamins thiamine and inositol by comparing growth on Tri chophyton agars 2, 3, and 4 with growth on vitamin free casamino acids agar (Trichophyton agar 1) (Dif co); 6) ability to grow at 37?C; and 7) ability to digest hairs after 2-3 wk incubation.35 Descriptions mi croscopic features are based mainly on slide culture preparations.34 Colonies (Fig. 5) three chameleon isolates are moderately fast growing, reaching diameters cm on phytone yeast extract and potato dex trose agar after 21 days at 25? or 30?C; growth rates were same on mycosel agar. Colonies are yel lowish white to pale yellow (3A2/4A3); flat or slightly raised in center (umbonate); dense, ex cept thin at margin; sometimes with concentric zones denser growth; powdery; and ten show ing fine fissures or cracks, with or without small droplets clear ex?date on surface, reverse uncolored. Colonies two N vriesii isolates are similar, except that y grow slightly faster, reaching diameters cm after 21 days. Co nidia (aleurioconidia) (Fig. 6) are pyriform (tear drop-shaped) or cl?vate (club-shaped), single-celled or rarely two-celled, and are borne sessile (i.e., formed directly on sides hyphae, not on stalks) or at ends branched fertile hyphae. Lateral and terminal conidia are xm long and xm wide but are commonly 3-6 u,m in length and single-celled. Portions hyphae frequently fragment to form arthroconidia, which are eir alternate (i.e., separated from each or by a cell or cells that undergo lytic disintegration) or in chains and separated by fission at septum (i.e., schizolytic dehiscence). Arthroconidia (Fig. 7) are cylindrical and are 4-9 u,m long and xm wide. A feature common to all isolates is formation undulate, solitary, sparsely septate lat eral branches (Fig. 8). Rarely, se branches ment to form arthroconidia. frag The chameleon isolates failed to fruit (form sex ual fruiting bodies) under any growth conditions, but isolates N vriesii formed fertile ascomata
9 450 JOURNAL OF ZOO AND WILDLIFE MEDICINE Figure 8. Undulate lateral branches (UAMH 7861). X460. DISCUSSION Figure 7. Fertile hyphae bearing sessile conidia (arrow head) and fragmenting to form arthroconidia (arrow) (UAMH 7582). X460. characteristic for species312 when grown on Tak ashio and oatmeal agars at 30?C. The N vriesii iso lates appeared initially to have lost sexual vigor, since y failed to form ascomata even after sev eral months at lower temperature incubation, but once sexual reproduction fruited also at 25?C on cereal agar. In reestablished, isolates special tests, chameleon isolates and two isolates N vriesii shared features: 1) strong urease following activity, usually by 5-7 days; 2) digestion hairs with formation per forating bodies; 3) greater than 50% growth inhi bition at 37?C; 4) no requirements for vitamins thi amine or inositol; 5) inhibition by salt at a concentration 3% (concentration causing >50% reduction colony diameter). On Bromcresol pur ple-milk solids-glucose agar after 11 days, cha meleon isolates showed moderate to pruse growth, no change in ph or trace acidity indicated by a color change to faint yellow, and strong clear ing milk solids beyond margin colony. On this medium, N vriesii isolates showed pruse growth, some clearing milk solids behind colony, and no change in ph or trace alkalinity indicated by a color change to faint purple within clear zone. Regarding taxon as "reminiscent" Ar throderma Berkeley, Apinis described Rollandina vriesii in genus Rollandina Patouillard based on a single isolate from skin and lung an Ame iva species.3 Ascomata N. vriesii lack appendages and are composed anastomosed asperulate hy phae that are constricted at septa and in which individual cells are fairly uniform in shape. Asco mata members genus Arthroderma (family Arthrodermataceae, Onygenales) differ in that y are composed hyphae in which cells are typ ically dumbbell-shaped or ossiform (bone-shaped), and hyphae may terminate in tightly coiled append ages.12 Apinis also described an associated ana morph or asexual stage as "pyriform or cylindrical to cl?vate conidia that are formed singly on vege tative hyphae Sporotrichum or Chrysospor ium type, or in chains {Oidium type) 2-3 X 3-8 xm in diameter."3 Later workers rejected Rollan dina as a nomen confusum, and Curran transferred R. vriesii to new genus Nannizziopsis Curran within family Onygenaceae (Onygenales), pri marily on basis ascospore shape and wall ornamentation.12 Ascospores N. vriesii are glo bose, measuring \xm in diameter, and punc tate-reticulate, whereas ascospores members Arthrodermataceae are oblate (round in face view, flattened in side view) and smooth. The ana morph has been accommodated in Chrysosporium. Since none chameleon isolates has fruited (i.e., formed fertile ascomata), y cannot be iden tified with certainty as N. vriesii; however, charac teristics ir conidia and physiology and ir isolation from lizards suggest a close relationship.
10 PAR? ET AL?CUTANEOUS MYCOSES IN CHAMELEONS 451 Similar features include 1) limited rmotolerance (restricted vate shape growth at 37?C); 2) pyriform or cl? conidia, which are occasionally 1-septate and borne sessile rar than on stalks; 3) presence lateral curved or undulate branches; 4) tendency to form arthroconidia that are eir alternate or in chains; 5) strong keratinolytic activ ity; and 6) similar physiologic features, including urease activity, cycloheximide tolerance, absence requirements for vitamins, and tolerance for salt at a concentration 3%. The chameleon isolates dif fered from N vriesii in having strongly powdery colonies that grew slightly more slowly, and in ir growth patterns on Bromcresol purple-milk solids glucose agar medium, with a clearing milk solids beyond margin colony. The chameleon isolates form a subset a larger group similar fungi obtained from skin lesions in members order Squamata and currently under study by two us (LS, RCS). Additional investigations rela tionships will include molecular analyses. The isolation same fungus from three cha meleons with cutaneous lesions in which fungal hy phae were observed by histology firmly establishes this fungus as an etiologic agent infection. The involvement fungus in deep mycosis as seen in case 2 is unusual and furr establishes a link with N vriesii, which isolated also from both skin and lung. It seems likely that this chameleon fungus has been reported previously, but correla tions are difficult because many reports fail to il lustrate cases rarely fungus, and isolates from se are deposited into culture collections. Previous reports concerning Trichophyton spe cjes4,is or Chrysosporium species could have been dealing with same fungus. Two chameleon isolates were identified initially by one laboratory as T. verrucosum and by a second laboratory as T. terrestre, but y differed slightly in in vitro growth characteristics. The sessile co nidia TV. vriesii are reminiscent microconidia species Trichophyton such as T mentagro phytes or T. terrestre, but N. vriesii fails to develop macroconidia typical Trichophyton species. Moreover, development characteristic fruit ing bodies at 30?C on certain media confirms ir distinction. Several reports link reptilian skin infec tions to Geotrichum candidum,24i92527a] a yeast-like hyphomycete in which hyphae fragment to form cylindrical arthroconidia. Although G. candidum seems unlikely to be confused with Chrysos porium anamorph N vriesii when character istic lateral conidia predominate, re may be a preponderance fission arthroconidia under some cultural conditions. Furr mycological evaluation isolates involved in reptilian skin infections would be useful in delineating etiologic agents. It is difficult to determine where or when chameleons became infected. The authors were in formed that anor chameleon, bought by a dif ferent party from same source as chameleons 1 and 2 and around same time, had been diag nosed elsewhere with fungal dermatitis and died shortly reafter. It is likely that case 1 and 2 lizards were from same shipment and were har boring organism at time purchase. This fungus may be part normal skin flora cha meleons. Unsanitary captive conditions, malnutri tion, high humidity, overcrowding, and poor water quality are thought to predispose reptiles to fungal disease.20 Parson's chameleons and jewel chame leons originate from Madagascar, and Jackson's chameleons from Africa.26 Parson's chameleons are notoriously short-lived in captivity, with one source stating a longevity record 11 months.6 We spec ulate that stresses capture, quarantine, and shipping contributed to undermine immunity se lizards to fungal infection. It is probable that pulmonary infection occurred by inhalation from a contaminated, poorly ventilated environment; how ever, hematogenous spread cannot be precluded. Micrilaremia in Parson's and intestinal trem atodiasis in jewel chameleon also may have contributed to lower hosts' resistance. Lesions reported in reptiles with skin mycoses are variable and ten poorly described. These in clude loosening horny part scales, nod ules, abrasions, plaques, crusts, granulomas, and fo cal necrotic ulcers, perhaps reflecting different stages disease progression. Focal black or gray discoloration skin observed in cases 1, 2, and 3. Bullous or vesicular lesions ("blister dis ease") in reptiles are common but are usually as sociated with bacteria, rarely with fungi.16 Affected animals are ten kept under suboptimal condi tions.16 The vesicular aspect early skin le sions in case 1 suggests that fungal disease must be considered by clinician when confronted with a bullous or vesicular skin condition in a chameleon. The use itraconazole in reptiles has not been well documented. Itraconazole is a triazole antifun gal with a broader spectrum activity, greater ef ficacy at lower dose, and less toxic potential than more frequently used ketoconazole.29 Itracona zole, like ketoconazole, inhibits ergosterol biosyn sis by binding to fungal, but not mammalian, cytochrome P-450 enzymes. Ergosterol is an essen tial component fungal cell membrane. When its synsis is disrupted, a defective membrane re sults; intracellular accumulation ergosterol pre
11 452 JOURNAL OF ZOO AND WILDLIFE MEDICINE cursors may also contribute to eventual cell rup ture.29 Itraconazole does not suppress cortisol syn sis in humans and dogs29 and thus should not interfere with animal's response to stress. Itra conazole has been shown to be effective against various agents systemic mycoses, yeasts, der matophytes, and some protozoans. The dose 10 mg/kg/day based on suggested dosage for dog (1-10 mg/kg/day).29 In case 1, rapy with itraconazole appeared to resolve lesions, al though transient anorexia and loss condition were noted. Elevations in creatinine kinase and aspartate aminotransferase activity remain unex plained. The possibility ongoing muscular dam age from fungal growth under seemingly qui escent stifle lesion considered. Itraconazole rapy not reinstituted because potential hepatoxicity in a patient with a palpably and radi ographically enlarged liver. It is likely that stress daily handling and medicating also detrimental to this animal's appetite and general health. The role itraconazole in demise chameleon in case 2 is undetermined, as hepatotox icity, main adverse effect, not identified. The animal died too soon to assess efficacy antifungal rapy. The use ketoconazole in case 3 did not seem to alter significantly gression lesions, although role played by fungus is unclear. Raising and maintaining lizard's environment temperature in upper zone species' pre ferred optimal temperature range should be gener ally beneficial and, given motolerance, may be rapeutic. pro N vriesifs limited r Acknowledgments: We thank Arlene Flis and Linda Abbott (University Alberta Micrungus Collection and Herbarium) for assistance with cul ture and photography, and Debbie Bateman and Gi sela Kittler (Ontario Veterinary College Microbi ology ir Laboratory) cooperation and Jamie and Lynda Horgan for and commitment. L. S. acknowl edges financial assistance from Natural Sci ences and Engineering Research Council Cana da. LITERATURE CITED 1. Abbott, S. P., L. Sigler, R. McAleer, D. A. McGough, M. G. Rinaldi, and G. Mizell Fatal cerebral my coses caused by ascomycete Chaetomium strumarium. J. Clin. Microbiol. 33: Abou-Gabal, M., and R. Zenoble Subcuta neous mycotic infection a Burmese python snake. My kosen 23: Apinis, A. E Concerning Rollandina. Trans. Br. Mycol. Soc. 55: Austwick, P. K. C, and I. F. Keymer Fungi and actinomycetes. In: Cooper, J. E., and O. F Jackson (eds.). Diseases Reptilia, vol 1. Academic Press, Harcourt Brace Jovanovich, London, England. Pp Austwick, P. K. C Some mycoses reptiles. VII Congress International Society for Human and Animal Mycology. Pp Barten, S. L The medical care iguanas and or common pet lizards. In: Vet. Clin. North Am. Small Anim. Pract.: Exotic Pet Medicine I. 23(6): Beynon, P. H., M. P. C. Lawton, and J. E. Cooper (eds.) Manual Reptiles. British Small Animal Veterinary Association, Sherdington, Cheltenham, Glou cestershire, U.K., Appendix III, p Borst, G. H. A., C. Vroege, F G. Poelma, P. Zwart, W J. Strik, and J. C. Peters Pathological findings on animals in Royal Zoological Gardens Rot terdam zoo during years 1963, 1964 and Acta Zool?gica et Pathologica Antverpiensia 56: Bryant, W. M Mycotic dermatitis in a col lection desert lizards. Am. Assoc. Zoo Vet. Proc. Annu. Meet. New Orleans, Louisiana. P Carmichael, J. W Chrysosporium and some or aleuriosporic Hyphomycetes. Can. J. Bot. 40: 1137? Cork, S. C, and P. H. G. Stockdale Mycotic disease in common New Zealand gecko {Hoplodac tylus maculatus). N. Z. Vet. J. 42: Currah, R. S Taxonomy Onygenales: Arthrodermataceae, Gymnoascaceae, Myxotrichaceae and Onygenaceae. Mycotaxon 24: de Vosjoli, P The General Care and Main tenance True Chameleons, part I, Husbandry. Advanced Vivarium Systems, Lakeside, California. 14. Dillberger, J., and M. Abou-Gabal Mycotic dermatitis in a black ratsnake. Mykosen 22: Frye, F. L Biom?dical and Surgical Aspects Captive Reptile Husbandry. Veterinary Medicine Pub lishing Co., Edwardsville, Kansas. 16. Frye, F. L Biom?dical and Surgical Aspects Captive Reptile Husbandry. Krieger Publishing Co., Malabar, Florida. 17. Hazell, S. L., G. J. Eamens, and R. A. Perry Progressive digital necrosis in eastern blue-tongued skink, Tiliqua scincoides (Shaw). J. Wildl. Dis. 21: Jacobson, E Diseases respiratory sys tem in reptiles. Vet. Med/Small Anim. Clin. 73: 1169? Jacobson, E. R Necrotizing mycotic der matitis in snakes: clinical and pathologic features. J. Am. Vet. Med. Assoc. 177: Jacobson, E. R Mycotic diseases reptiles. In: Montali, R. J., and G. Migaki (eds.). The Comparative Pathology Zoo Animals. Smithsonian Institution, Wash ington, D.C. Pp Kane, J., L. Sigler, and R. C. Summerbell Improved procedures for differentiating Microsporum per
12 PAR? ET AL.?CUTANEOUS MYCOSES IN CHAMELEONS 453 sicolor from Trichophyton mentagrophytes. J. Clin. Mi crobiol. 25: Kane, J., R. C. Summerbell, L. Sigler, S. Krajden, and G. Land Laboratory Handbook Dermato phytes: A Clinical Guide and Laboratory Manual Der matophytes and Or Filamentous Fungi from Skin, Hair and Nails. Star Publishing Co., Belmont, California. 23. Keymer, I. F Report pathologist, 1973 and J. Zool. London 178: Kornerup, A., and J. H. Wanscher Methuen Handbook Color, 3rd ed. Eyre Methuen Ltd., London, U.K. 25. Marcus, L. C Veterinary Biology and Med icine Captive Amphibians and Reptiles. Lea and Fe biger, Philadelphia, Pennsylvania. 26. Martin, J., and A. Wolfe Masters Dis guise: A Natural History Chameleons. Facts on File, New York, New York. 27. McKenzie, R. A., and P. E. Green Mycotic dermatitis in captive carpet snakes. J. Wildl. Dis. 12: Migaki, G Mycotic diseases in captive an imals?a mycopathologic overview. In: Montali, R. J., and G. Migaki (eds.). The Comparative Pathology Zoo Animals. Smithsonian Institution, Washington, D.C. Pp Mundell, A. C New rapeutic agents in veterinary dermology. Vet. Clin. North Am. Small Anim. Med. 20, 6: Page, L. A Diseases and infections snakes: a review. Bull. Wildl. Dis. 2: Rees, R. G Keratinophilic fungi from Queensland. I. Isolations from animal hair and scales. Sa bouraudia 5: Schildger, B. J., H. Frank, T. G?bel, and R. Weiss Mycotic infections integument and inner or gans in reptiles. Herpetopathologia 2: Sigler, L., J. L. Harris, D. M. Dixon, A. L. Flis, I. F Salkin, M. Kemna, and R. A. Duncan Micro biology and potential virulence Sporothrix cyanescens, a fungus rarely isolated from blood and skin. J. Clin. Mi crobiol. 28: Sigler, L Preparing and mounting slide cul tures. In: Isenberg, H. D. (ed.). Clinical Microbiology Pro cedures Handbook. American Society for Microbiology, Washington, D.C. Sect. 6, p Sigler, L Chrysosporium and molds resem bling dermatophytes. In: Kane, J., R. C. Summerbell, L. Sigler, S. Krajden, and G. Land (eds.). Laboratory Hand book Dermatophytes: A Clinical Guide and Laboratory Manual Dermatophytes and Or Filamentous Fungi from Skin, Hair and Nails. Star Publishing Co., Belmont, California. 36. Summerbell, R. C, S. A. Rosenthal, and J. Kane Rapid method for differentiation Trichophyton rubrum, Trichophyton mentagrophytes, and related der matophyte species. J. Clin. Microbiol. 26: Van Oorschot, C. A. N A revision Chry sosporium and allied genera. Stud. Mycol. 20: Von Arx, J. A The Genera Fungi Spor ulating in Pure Culture, 3rd ed. J. Cramer, Vaduz, Liech tenstein. 39. Weitzman, I., J. Kane, and R. C. Summerbell Trichophyton, Microsporum, Epidermophyton, and agents superficial mycoses. In: Murray, P. R., E. J. Bar on, M. F. Pfaller, F. C. Tenover, and R. H. Yolken (eds.). Manual Clinical Microbiology, 6th ed. American So ciety for Microbiology, Washington, D.C. Pp Werner, R., M. A. Balady, and G. J. Kolaja Phycomycotic dermatitis in an eastern indigo snake. Vet. Med./Small Anim. Clin. 73: Wissman, M. A., and B. Parsons Derma tophytosis green iguanas {Iguana iguana). J. Small Exot. Anim. Med. 2(3): Zwart, P., F. G. Poelma, W J. Strik, J. C. Peters, and J. J. W. Polder Report on births and deaths occurring in Gardens Royal Rotterdam Zoo dur ing years 1961 and Tijdschr. Diergeneesk. 93: Zwart, P., and H. D. Schr?der Mykosen. In: Ippen, R., H. D. Schr?der, and K. Elze (eds.). Handbuch der Zookrankheiten, vol. 1. Akademie Verlag, Berlin, Ger many. Received for publication 15 March 1996.
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